Fire trucks at the rear of the building doused the flames, while Egg Harbor Township police monitored the entrance, turning away people unaware of the situation.
Cardiff Volunteer Fire Company Chief Steven Sear said the blaze was under control about 3:30 p.m., but firefighters remained on the scene until 5 p.m.
“The fire was contained to the roof, and there is water damage to a storage area,” Sear said.
The cause of the fire is under investigation, Sear said. The store remained closed Sunday night.